The STPP powder is mainly used in the preparation of detergent slurry. Molecular structure of STPP is presented in two different forms called phase 1 and phase 2. The rate of composition of the STPP in phase 1 and phase 2 gives various rate of hydration. In general, for each technique of slurry preparation, there is a specific quality of STPP.

For modern installations of detergent, with fast and powerful mixers, the stpp high rate of hydration is recommended. It permits reduction time in the preparation of the slurry, saving energy in the heating and the drying of the slurry and a better quality of detergent powder.

For other installations, the STPP with low or middle rate of hydration is recommended; this prevents the formation of lumps during the slurry preparation, but requires a slower preparation time and an extra energy consumption.